Preheat the oven to 350℉.
In a large dutch oven, melt the butter over medium heat.
Add the onions and garlic and sauté until soft.
Pour the dry arborio into the dutch oven and stir to lightly coat the rice with the butter. Give the rice a few minutes in the hot butter to enable the starches to break down a little to create the signature texture of risotto.
Add the pinot grigio and stir for about 3-4 minutes or until the liquid becomes creamy.
Add the chicken broth, milk, sea salt, pepper, and oregano.
Stir to combine all the ingredients and bring the dutch oven to a simmer.
Once the broth begins to simmer, cover and place the dutch oven into the preheated oven.
Bake the rice for 30 minutes.
After baking, remove from the oven and allow to rest for 1 hour at room temperature. Do not remove the cover while the risotto is cooling.
Once it is cool enough to refrigerate, stir the mozzarella and parmesan into the rice and refrigerate until cold. I usually refrigerate for 7-8 hours before assembling and frying the arancini.